Izvestiya MGTU MAMIIzvestiya MGTU MAMI2074-05302949-1428Moscow Polytechnic University6788910.17816/2074-0530-67889Research ArticleDetermination of the minimum curvature radius of a die for isothermal direct axisymmetric extrusion of aluminum alloy AD35VoronkovV. I.+7 926 135-63-40v-i-w@bk.ruMoscow State University of Mechanical Engineering (MAMI)2001201481-222122730042021Copyright © 2014, Voronkov V.I.2014The paper contains the description of technique and the graphs for determination of the optimal curvature radius in the tool for isothermal forging with direct extrusion in axisymmetric matrix. This method is based on solving of the problem of minimizing of plastic deformation total power in flow of metal in axisymmetric matrix without curves, i.e. with free flow of material at the transition. Theoretical solution to the problem was verified experimentally.optimal curvature radiusmethod of power balancedirect extrusionisothermal forgingalloy AD35оптимальный радиус закругленияметод баланса мощностипрямое выдавливаниеизотермическая штамповкасплав АД35